Alert archive / Florida / Special Weather Statements in 2012

Special Weather Statement, NWS Tallahassee, FL

July 21, 2012Lafayette County, Florida

NWS Tallahassee, FL issued this special weather statement at Jul 21, 2012, 4:59 PM EDT for Lafayette County, Florida. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 21, 2012, 4:59 PM EDT (20:59 UTC)
Expired
Jul 21, 2012, 5:30 PM EDT
In force
31 min
Issued by
NWS Tallahassee, FL

County Lafayette County, FL

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 9.0 hours before the alert went out and 251 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2012-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2031 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2012-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2031 J/kg
Mixed-layer CIN
-37 J/kg
Mixed-layer LCL
937 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tallahassee, FL wrote its last area forecast discussion before this special weather statement went out at Jul 21, 11:50 AM EDT, 5 hours 9 minutes earlier.

Area forecast discussion, Jul 21, 11:50 AM EDT, 5 hours 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1150 AM EDT Sat Jul 21 2012

.UPDATE...With the substantial amount of drying and warming in the
morning soundings (especially to the east where TAE has dropped down
to a PWAT of 1.41", with a significant 2-3 degree Celsius rise in
the layer between 1000 and 725 mb), trimmed back rest of the morning
to 18Z PoPs to silent 10s from just west to the Apalachicola and
Chattahoochee Rivers, eastward across the remainder of the interior
CWA. Left the 20s in to the west, and 20s and 30s in over the
Coastal Waters, where moisture content, Sfc Tds, and mid-level
Theta-E values are higher. This should hold true in the afternoon as
well, and left current NW to SE PoP Gradient in place from the
previous package (60%-20%). This scenario is also very well depicted
in most of the Hi-Res WRF runs, so the current aftn package appears
to be on track.

&&

.AVIATION [through 12Z Sunday]...Expect mainly VFR conditions to
prevail throughout the early morning hours across the region except
for brief MVFR Cigs ECP and LIFR Conditions at VLD. With the morning
sounding drying out substantially at TLH, will amend Tafs to remove
the convective tempo, and may have to pull back on ABY as well.
Also, already pushed the timing back on ECPs Taf from a 15Z start to
to 18Z. VFR cigs and vsbys good bet after 08z, especially at
ABY/DHN/ VLD.

&&

.MARINE...Winds and seas will be a little higher over our western
waters this morning. Otherwise, conditions will be fairly uniform
with light winds and low seas across the entire marine area through
at least through the middle of next week. Winds should remain
generally out of the south today, then become more out of the south
to southeast Sunday through Tuesday.

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
AL...None.
GA...None.
FL...None.
GM...None.
&&

Gould
Hazardous weather outlook, Jul 21, 2:31 PM EDT, 2 hours 28 minutes before
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In the hours before

Special weather statement, Jul 21, 4:37 PM EDT, 22 minutes before
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Special weather statement, Jul 21, 4:59 PM EDT, 0 minutes before
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The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 21, 2:19 PM EDTRip Current StatementTAEBay, Walton9 hr
Jul 21, 4:37 PM EDTSpecial Weather StatementTAELafayette23 min

Nearby

Special Weather Statements in Florida, 2012Every special weather statement in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.